2 files changed, 14 insertions, 0 deletions
diff --git a/libbb/Kbuild b/libbb/Kbuild
index 4865c9c7c..4e6eec38b 100644
--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@@ -77,6 +77,7 @@ lib-y += sha1.o
 lib-y += simplify_path.o
 lib-y += skip_whitespace.o
 lib-y += speed_table.o
+lib-y += str_tolower.o
 lib-y += trim.o
 lib-y += u_signal_names.o
 lib-y += udp_io.o
diff --git a/libbb/str_tolower.c b/libbb/str_tolower.c
new file mode 100644
index 000000000..037f717c7
--- /dev/null
+++ b/libbb/str_tolower.c
@@ -0,0 +1,13 @@
+/* vi set: sw=4 ts=4: */
+/* Convert string str to lowercase, return str.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+#include "libbb.h"
+char* str_tolower(char *str)
+{
+	char *c;
+	for (c = str; *c; ++c)
+		*c = tolower(*c);
+	return str;
+}